Sudden, drastic drop in # of links and root domains on website?

[wlefevre]

Noticed that my links and root domain numbers had dropped by ~40%, seemingly overnight. Any idea what could have contributed to this (Toolbar update???)?

[KeriMorgret]

Specifically in this post, Rand says "Because this update is much smaller in total URL size (~50% of the prior, 165 billion URL index), your link count totals will likely be much smaller, even if you've grown your link building efforts."

It's not you, it's us, as part of the balance between deeper indexes and faster indexes.

[David_ODonnell]

If you're talking about the # of links reported in SEOmoz / Open Site Explorer, a smaller index = fewer results. See: http://www.seomoz.org/blog/july-mozscape-update

[Boodreaux]

Many of my links dropped off too.  Not sure what happened this month.